施工项目的控制目标主要有进度控制目标、质量控制目标、成本控制目标、安全控制目标和施工现场控制目标。

安全员是施工项目安全生产第一责任人

直接工程费包括人工费、材料费、施工机械使用费。

影响工程质量的因素有：人员素质、工程材料、机械设备、方法、环境条件。

动态控制是按照计划、实施、检查这三个不断循环的过程进行控制的。

不得将分包工程进行转包或再分包。

施工进度计划只能用横道图表示。

Imagineyouenteracarwithnosteeringwheel,nobrakeoracceleratorpedals(踏板).Underavoice-activatedcommand,yousayanaddress“Thefastestroutewilltakeus15.3minutes.ShouldItakeit?”Yousay“yes”andyouareonyourway.Thecarrespondsandstartsmovingallbyitself.Allyouhavetodoissitbackandrelax.Howweirdwoulditbeif,onedayinthefuture,everyonehadsuchacar?Nocrazydiving,noinsults,nocuttingin;trafficlawswouldberespectedanddrivingmuchsafer.Ontheotherhand,imaginethecostsavingsforlocalpoliceenforcementandtownbudgetswithoutallthosespeedingandparkingtickets.Anewtechnologyhasthepotentialtochangemodernsocietyinradicalways.There’snoquestionthatself-drivingvehiclescouldbeanenormousbenefit.Thepotentialforsafercarsmeansaccidentstatisticswoulddrop:some94%ofroadaccidentsintheU.S.involvehumanerror.Olderdriversandvisually-orphysically-impairedpeoplewouldgainanewleveloffreedom.Maintainingsafespeedsandbeingelectric,self-drivingcarswoulddrasticallyreducepollutionlevelsanddependencyonnon-renewablefuels.Roadswouldbequieter,peoplesafer.Butwemustalsoconsidertheimpactofthenewtechnologyonthosewhonowdependondrivingfortheirlivelihoods.AccordingtotheU.S.DepartmentofLabor,inMay2015therewere505,560registeredschoolbusdrivers.TheAmericanTruckingAssociationlistsapproximately3.5millionprofessionaltruckdriversintheU.S.Thecompaniesdevelopingself-drivingvehiclesshouldbepartneringwithstateandfederalauthoritiestoofferretrainingforthismassiveworkforce,manyofwhomwillbedisplacedbythenewtechnology.Thisissimilartowhat’shappeninginthecoalandoilindustries,asituationthatfuelsmuchofthecurrentpoliticaldiscontentinthiscountry.Newtechnologieswill,andshould,bedeveloped.Thisishowsocietymovesforward.However,progresscan’tbeone-sided.Itisnecessaryforthecompaniesandstateagenciesinvolvedtoconsidertheethicalconsequencesofthesepotentialchangestobuildabetterfutureforall.13.Whatwouldbethenegativeimpactofdriverlesscars?

Imagineyouenteracarwithnosteeringwheel,nobrakeoracceleratorpedals(踏板).Underavoice-activatedcommand,yousayanaddress“Thefastestroutewilltakeus15.3minutes.ShouldItakeit?”Yousay“yes”andyouareonyourway.Thecarrespondsandstartsmovingallbyitself.Allyouhavetodoissitbackandrelax.Howweirdwoulditbeif,onedayinthefuture,everyonehadsuchacar?Nocrazydiving,noinsults,nocuttingin;trafficlawswouldberespectedanddrivingmuchsafer.Ontheotherhand,imaginethecostsavingsforlocalpoliceenforcementandtownbudgetswithoutallthosespeedingandparkingtickets.Anewtechnologyhasthepotentialtochangemodernsocietyinradicalways.There’snoquestionthatself-drivingvehiclescouldbeanenormousbenefit.Thepotentialforsafercarsmeansaccidentstatisticswoulddrop:some94%ofroadaccidentsintheU.S.involvehumanerror.Olderdriversandvisually-orphysically-impairedpeoplewouldgainanewleveloffreedom.Maintainingsafespeedsandbeingelectric,self-drivingcarswoulddrasticallyreducepollutionlevelsanddependencyonnon-renewablefuels.Roadswouldbequieter,peoplesafer.Butwemustalsoconsidertheimpactofthenewtechnologyonthosewhonowdependondrivingfortheirlivelihoods.AccordingtotheU.S.DepartmentofLabor,inMay2015therewere505,560registeredschoolbusdrivers.TheAmericanTruckingAssociationlistsapproximately3.5millionprofessionaltruckdriversintheU.S.Thecompaniesdevelopingself-drivingvehiclesshouldbepartneringwithstateandfederalauthoritiestoofferretrainingforthismassiveworkforce,manyofwhomwillbedisplacedbythenewtechnology.Thisissimilartowhat’shappeninginthecoalandoilindustries,asituationthatfuelsmuchofthecurrentpoliticaldiscontentinthiscountry.Newtechnologieswill,andshould,bedeveloped.Thisishowsocietymovesforward.However,progresscan’tbeone-sided.Itisnecessaryforthecompaniesandstateagenciesinvolvedtoconsidertheethicalconsequencesofthesepotentialchangestobuildabetterfutureforall.13.Whatwouldbethenegativeimpactofdriverlesscars?

4.删除基本表用ALTER_语句，删除基本表的元组用UPDATE语句.

可在C语言中用作用户标识符的一组标识符是（）

有以下程序main(){intp[8]={11,12,13,14,15,16,17,18}，i=0,j=0;while(i++<7)if(p[i]%2)j+=p[i];printf("%d",j);}程序运行后的输出结果是（　）

关系R中能唯一标识一个元组的是它的（）。A.主码B.候选码C.外部码D.全码

元组变量t=("cat","dog","tiger","human")，t[::–1]的结果是('human','tiger','dog','cat')‪‪‪‪‪‪‫‪‪‪‪‪‫‪‪‪‪‪‫‪‪‪‪‪‫‪‪‪‪‪‪‫‪

元组变量t=("cat","dog","tiger","human")，t[::–1]的结果是('human','tiger','dog','cat')‪‪‪‪‪‪‫‪‪‪‪‪‫‪‪‪‪‪‫‪‪‪‪‪‫‪‪‪‪‪‪‫‪